package map;

import java.util.*;

/**
 * Map的遍历
 * 遍历Map有三种方式：
 * 1：key的遍历
 * 2：value的遍历
 * 3：key，value一起遍历
 */
public class MapDemo2 {
    public static void main(String[] args) {
        Map<String,Integer> map = new HashMap<>();
        map.put("语文",99);
        map.put("数学",98);
        map.put("英语",97);
        map.put("物理",96);
        map.put("化学",99);
        System.out.println(map);

        Set<String> keySet = map.keySet();
        for(String key:keySet){
            System.out.println("key:"+key);
        }
        Set<Map.Entry<String,Integer>> entrySet = map.entrySet();
        for(Map.Entry<String,Integer> entry : entrySet){
            String key = entry.getKey();
            Integer value = entry.getValue();
            System.out.println(key+":"+value);
        }

        Collection<Integer> values = map.values();
        for(Integer value:values){
            System.out.println("value:"+value);
        }
        values.forEach(e-> System.out.println(e));

        map.forEach((k,v)-> System.out.println(k+":"+v));
    }

}
